How a Net 30 due date is counted
A payment term such as Net 30 means that payment is due 30 days after a starting date, usually the invoice date. The days are calendar days: weekends count, and so do holidays. The starting date is day zero, so the first day of the term is the following day. For an invoice dated Sat 31 Jan 2026, day 1 is 1 February and day 30 is Mon 2 Mar 2026, because February 2026 has 28 days. The same rule gives Wed 4 Nov 2026 for an invoice dated Mon 5 Oct 2026, and Tue 29 Feb 2028 for one dated Sun 30 Jan 2028, since 2028 is a leap year and February has 29 days.
The common named terms are Net 7, Net 15, Net 30, Net 45, Net 60 and Net 90. The number is simply the count of calendar days. "Due on receipt" means the start date itself. This calculator also accepts a custom number of days from 0 to 365, and a second term so that you can see two dates side by side.
Which date does the clock start from?
Most invoices start the clock on the invoice date. Some contracts instead start it on the date goods were delivered, the date services were completed, or the date the customer received the invoice. The calculator labels its first box "Invoice date (or the start date your contract names)" for that reason. If your contract says the term runs from delivery, enter the delivery date. If the contract and the invoice disagree, the contract usually governs, and a lawyer or your accountant is the person to ask.
Weekend due dates
When the arithmetic lands on a Saturday or Sunday, the calculator keeps that date and flags it. For example, an invoice dated Sat 31 Jan 2026 on Net 7 is due Sat 7 Feb 2026. Some businesses treat a weekend due date as the next business day, some as the previous one, and some leave it as it is, so the page does not choose for you. Holiday calendars, which differ by country and state, are not applied at all. The date calculator on this site can count business days if you need that.
Early-payment discounts such as 2/10 Net 30
A term written 2/10 Net 30 means that a 2% discount applies if the invoice is paid within 10 days, and that the full amount is due within 30 days. Enter 10 as the early-payment days and 2 as the discount percentage. For the invoice dated Sat 31 Jan 2026, the early-payment deadline is Tue 10 Feb 2026 and the full due date is Mon 2 Mar 2026, 20 days later.
The percentage is used only to label the term. The calculator does not work out the amount of the discount, the interest rate it implies or any other money figure, because the right figure depends on the invoice and the contract. The early-payment days must be at least 1 and less than the main term, since a deadline for a discount has to come before the due date.
What this calculator leaves out
- End-of-month (EOM) terms. Terms such as Net 30 EOM start the count at the end of the month. They are not covered here.
- Holidays and business-day rules. Only calendar days are counted.
- Late fees and interest. No late payment charge is calculated.
- Legal deadlines. Statutory payment periods and collection deadlines vary by place, and this page is not legal advice.
For adding days to a date in other settings, use the date calculator. If you invoice clients as a freelancer, the billable rate calculator helps with pricing, and the full calculator directory lists the other money tools. Dates you enter here are never saved or sent.
Frequently asked questions
What does Net 30 mean on an invoice?
Payment is due 30 calendar days after the start date, normally the invoice date. The start date itself is day zero.
Is the day of the invoice counted?
No. Counting begins the next day, so Net 30 from Sat 31 Jan 2026 is Mon 2 Mar 2026.
What happens if the due date is a weekend?
This calculator keeps the date and flags it. Whether the due date moves is a matter for your contract or your usual practice.
What does 2/10 Net 30 mean?
A 2% discount if paid within 10 days; otherwise the full amount is due in 30 days. The calculator shows both deadlines.
Does it handle end-of-month terms?
Not in this version. It counts calendar days from the start date only.
Sources and limits of this page
Payment-term conventions are summarized from accounting software help pages such as the QuickBooks article About payment terms. The day counts are exact calendar arithmetic. This page is general information, not legal, tax or accounting advice; the contract between you and your customer decides the real due date.